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SCJP #1
Chapter 1
| Question | Answer |
|---|---|
| What 3 things can legal Java identifiers start with? | underscore, letter, currency character |
| Legal Java identifiers can contain... (4) | letter, underscore, currency character, number |
| Java Identifiers are case sensitive. True/False | True |
| Name two things a legal Java identifier cannot use? | 1) cannot start with a number 2) cannot use a Java keyword/reserved word |
| In Java Coding Standards, a class or interface name should be... (3) | 1) first character uppercase 2) camelCase 3) should typically be a noun. |
| In Java Coding Standards, a method name should be... (3) | 1) first character lowercase 2) camelCase 3) should typically be a noun-verb pair. |
| In Java Coding Standards, a variable name should be... (3) | 1) first character lowercase 2) camelCase 3) should be a short meaningful noun. |
| In Java Coding Standards, a constant should be... (4) | 1) static 2) final 3) upercase characters 4) underscore character separates words |
| In JavaBeans standards, a setter method should be... (4) | 1) "set" followed by property name 2) public 3) takes argument whose type is same as the property 4) void return type |
| In JavaBeans standards, a getter method should be... (4) | 1) "get" followed by property name 2) public 3) takes no argumentsos 4) return type matches property type. |
| What are JavaBean Listener naming rules? (3) | 1) to register listener: lowercase "add", then listener type, then "Listener" 2) to remove a listener: lowercase "remove", then listener type, then the word "Listener" 3) the type of Listener (add or remove) must be paased to method as an argument |
| Name Java access modifiers (3) | public, private, protected |
| What are the Java access controls (4) | public, private, protected, default |
| A class can have what access modifiers | public and default |
| Class access means you can... (3) | 1) create an instance of the class 2) extend the class 3) access the accessable methods and variables in the class |
| What non-access modifiers can a class have? (3) | final, abstract, strictfp |
| What does it mean when a class or method is marked strictfp | Any method or method code in the class conforms to IEEE 754 standards for floating points (behavior is not platform specific) |
| Final keyword means: (3) | 1) class cannot be subclassed 2) method cannot be overridden 3) variable cannot be assigned |
| Abstract classes can never be: | instantiated |
| Methods marked abstract end in: | a semi-colon |
| If one method in a class is abstract: | the whole class must be marked abstract. |
| If a class is abstract, it cannot be: | final |
| If a class is final, it cannot be: | abstract |
| An interface is a contract. True/False | True |
| An interface is a 100% _____ class. | abstract |
| Interfaces can be implemented by... | any class from any inheritance tree. |
| Interfaces are implicitly: | public and abstract, whether declared or not. |
| Interface variables must be declared as: (3) | public, static, final |
| Interface modifiers cannot be: (4) | static, final, strictfp, native |
| Interfaces can extend: | 1 or more interfaces. |
| Interfaces cannot extend | anything other than an interface. |
| Interfaces cannot implement | another interface or class. |
| An interface declaration must contain | the keyword "interface" |
| Interface types cannot be used polymorphically. True/False | False |
Created by:
drema
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